Union is duplicating itself, and separating only a part of itself when separating. Potential bug?

I was trying to fix one of my constrainted builds and I tried to separate this union to do so. I noticed that it duplicates itself, only separates a portion of what it’s supposed to, and it does this infinitely. Trust me, I’ve tried about 15 times in a row, the same behavior keeps happening, and I still cannot separate the other portion of the union. Yes, it is a single union. Moves as one piece with Ctrl + Alt select enabled. Not a grouped model either.
https://i.gyazo.com/e385fe9a1ac7e5b84d89d10f8541f628.mp4

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Im not sure how you would go about fixing this, but unions are buggy and you should try to avoid using them.

How are we supposed to 3D model on Roblox then?